[Intel-gfx] [PATCH] drm/i915/gem: Support discontiguous lmem object maps
Chris Wilson
chris at chris-wilson.co.uk
Thu Jan 2 10:31:44 UTC 2020
Create a vmap for discontinguous lmem objects to support
i915_gem_object_pin_map().
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Matthew Auld <matthew.auld at intel.com>
---
drivers/gpu/drm/i915/gem/i915_gem_lmem.c | 40 ----------
drivers/gpu/drm/i915/gem/i915_gem_lmem.h | 8 --
drivers/gpu/drm/i915/gem/i915_gem_pages.c | 74 +++++++++++--------
.../gpu/drm/i915/gem/selftests/huge_pages.c | 41 +++++-----
.../drm/i915/selftests/intel_memory_region.c | 33 ++++-----
5 files changed, 73 insertions(+), 123 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_lmem.c b/drivers/gpu/drm/i915/gem/i915_gem_lmem.c
index 520cc9cac471..70543c83df06 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_lmem.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_lmem.c
@@ -16,46 +16,6 @@ const struct drm_i915_gem_object_ops i915_gem_lmem_obj_ops = {
.release = i915_gem_object_release_memory_region,
};
-/* XXX: Time to vfunc your life up? */
-void __iomem *
-i915_gem_object_lmem_io_map_page(struct drm_i915_gem_object *obj,
- unsigned long n)
-{
- resource_size_t offset;
-
- offset = i915_gem_object_get_dma_address(obj, n);
- offset -= obj->mm.region->region.start;
-
- return io_mapping_map_wc(&obj->mm.region->iomap, offset, PAGE_SIZE);
-}
-
-void __iomem *
-i915_gem_object_lmem_io_map_page_atomic(struct drm_i915_gem_object *obj,
- unsigned long n)
-{
- resource_size_t offset;
-
- offset = i915_gem_object_get_dma_address(obj, n);
- offset -= obj->mm.region->region.start;
-
- return io_mapping_map_atomic_wc(&obj->mm.region->iomap, offset);
-}
-
-void __iomem *
-i915_gem_object_lmem_io_map(struct drm_i915_gem_object *obj,
- unsigned long n,
- unsigned long size)
-{
- resource_size_t offset;
-
- GEM_BUG_ON(!i915_gem_object_is_contiguous(obj));
-
- offset = i915_gem_object_get_dma_address(obj, n);
- offset -= obj->mm.region->region.start;
-
- return io_mapping_map_wc(&obj->mm.region->iomap, offset, size);
-}
-
bool i915_gem_object_is_lmem(struct drm_i915_gem_object *obj)
{
return obj->ops == &i915_gem_lmem_obj_ops;
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_lmem.h b/drivers/gpu/drm/i915/gem/i915_gem_lmem.h
index 7c176b8b7d2f..fc3f15580fe3 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_lmem.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_lmem.h
@@ -14,14 +14,6 @@ struct intel_memory_region;
extern const struct drm_i915_gem_object_ops i915_gem_lmem_obj_ops;
-void __iomem *i915_gem_object_lmem_io_map(struct drm_i915_gem_object *obj,
- unsigned long n, unsigned long size);
-void __iomem *i915_gem_object_lmem_io_map_page(struct drm_i915_gem_object *obj,
- unsigned long n);
-void __iomem *
-i915_gem_object_lmem_io_map_page_atomic(struct drm_i915_gem_object *obj,
- unsigned long n);
-
bool i915_gem_object_is_lmem(struct drm_i915_gem_object *obj);
struct drm_i915_gem_object *
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_pages.c b/drivers/gpu/drm/i915/gem/i915_gem_pages.c
index 75197ca696a8..b4d242f7001c 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_pages.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_pages.c
@@ -158,9 +158,7 @@ static void __i915_gem_object_reset_page_iter(struct drm_i915_gem_object *obj)
static void unmap_object(struct drm_i915_gem_object *obj, void *ptr)
{
- if (i915_gem_object_is_lmem(obj))
- io_mapping_unmap((void __force __iomem *)ptr);
- else if (is_vmalloc_addr(ptr))
+ if (is_vmalloc_addr(ptr))
vunmap(ptr);
else
kunmap(kmap_to_page(ptr));
@@ -236,46 +234,44 @@ int __i915_gem_object_put_pages(struct drm_i915_gem_object *obj)
return err;
}
+static inline pte_t iomap_pte(resource_size_t base,
+ dma_addr_t offset,
+ pgprot_t prot)
+{
+ return pte_mkspecial(pfn_pte((base + offset) >> PAGE_SHIFT, prot));
+}
+
/* The 'mapping' part of i915_gem_object_pin_map() below */
static void *i915_gem_object_map(struct drm_i915_gem_object *obj,
enum i915_map_type type)
{
- unsigned long n_pages = obj->base.size >> PAGE_SHIFT;
+ unsigned long n_pte = obj->base.size >> PAGE_SHIFT;
struct sg_table *sgt = obj->mm.pages;
- struct sgt_iter sgt_iter;
- struct page *page;
- struct page *stack_pages[32];
- struct page **pages = stack_pages;
- unsigned long i = 0;
+ pte_t *stack_ptes[32];
+ pte_t **ptes = stack_ptes;
+ struct vm_struct *area;
pgprot_t pgprot;
- void *addr;
-
- if (i915_gem_object_is_lmem(obj)) {
- void __iomem *io;
-
- if (type != I915_MAP_WC)
- return NULL;
- io = i915_gem_object_lmem_io_map(obj, 0, obj->base.size);
- return (void __force *)io;
- }
+ if (!i915_gem_object_has_struct_page(obj) && type != I915_MAP_WC)
+ return NULL;
/* A single page can always be kmapped */
- if (n_pages == 1 && type == I915_MAP_WB)
+ if (n_pte == 1 && type == I915_MAP_WB)
return kmap(sg_page(sgt->sgl));
- if (n_pages > ARRAY_SIZE(stack_pages)) {
+ if (n_pte > ARRAY_SIZE(stack_ptes)) {
/* Too big for stack -- allocate temporary array instead */
- pages = kvmalloc_array(n_pages, sizeof(*pages), GFP_KERNEL);
- if (!pages)
+ ptes = kvmalloc_array(n_pte, sizeof(*ptes), GFP_KERNEL);
+ if (!ptes)
return NULL;
}
- for_each_sgt_page(page, sgt_iter, sgt)
- pages[i++] = page;
-
- /* Check that we have the expected number of pages */
- GEM_BUG_ON(i != n_pages);
+ area = alloc_vm_area(obj->base.size, ptes);
+ if (!area) {
+ if (ptes != stack_ptes)
+ kvfree(ptes);
+ return NULL;
+ }
switch (type) {
default:
@@ -288,12 +284,26 @@ static void *i915_gem_object_map(struct drm_i915_gem_object *obj,
pgprot = pgprot_writecombine(PAGE_KERNEL_IO);
break;
}
- addr = vmap(pages, n_pages, 0, pgprot);
- if (pages != stack_pages)
- kvfree(pages);
+ if (i915_gem_object_has_struct_page(obj)) {
+ struct sgt_iter iter;
+ struct page *page;
+
+ for_each_sgt_page(page, iter, sgt)
+ **ptes++ = mk_pte(page, pgprot);
+ } else {
+ const resource_size_t iomap = obj->mm.region->iomap.base;
+ struct sgt_iter iter;
+ dma_addr_t addr;
+
+ for_each_sgt_daddr(addr, iter, sgt)
+ **ptes++ = iomap_pte(iomap, addr, pgprot);
+ }
+
+ if (ptes != stack_ptes)
+ kvfree(ptes);
- return addr;
+ return area->addr;
}
/* get, pin, and map the pages of the object into kernel space */
diff --git a/drivers/gpu/drm/i915/gem/selftests/huge_pages.c b/drivers/gpu/drm/i915/gem/selftests/huge_pages.c
index 2479395c1873..249a4d24d678 100644
--- a/drivers/gpu/drm/i915/gem/selftests/huge_pages.c
+++ b/drivers/gpu/drm/i915/gem/selftests/huge_pages.c
@@ -1017,38 +1017,33 @@ __cpu_check_shmem(struct drm_i915_gem_object *obj, u32 dword, u32 val)
return err;
}
-static int __cpu_check_lmem(struct drm_i915_gem_object *obj, u32 dword, u32 val)
+static int __cpu_check_vmap(struct drm_i915_gem_object *obj, u32 dword, u32 val)
{
- unsigned long n;
+ unsigned long n = obj->base.size >> PAGE_SHIFT;
+ u32 *ptr;
int err;
- i915_gem_object_lock(obj);
- err = i915_gem_object_set_to_wc_domain(obj, false);
- i915_gem_object_unlock(obj);
- if (err)
- return err;
-
- err = i915_gem_object_pin_pages(obj);
+ err = i915_gem_object_wait(obj, 0, MAX_SCHEDULE_TIMEOUT);
if (err)
return err;
- for (n = 0; n < obj->base.size >> PAGE_SHIFT; ++n) {
- u32 __iomem *base;
- u32 read_val;
-
- base = i915_gem_object_lmem_io_map_page_atomic(obj, n);
+ ptr = i915_gem_object_pin_map(obj, I915_MAP_WC);
+ if (IS_ERR(ptr))
+ return PTR_ERR(ptr);
- read_val = ioread32(base + dword);
- io_mapping_unmap_atomic(base);
- if (read_val != val) {
- pr_err("n=%lu base[%u]=%u, val=%u\n",
- n, dword, read_val, val);
+ ptr += dword;
+ while (n--) {
+ if (*ptr != val) {
+ pr_err("base[%u]=%08x, val=%08x\n",
+ dword, *ptr, val);
err = -EINVAL;
break;
}
+
+ ptr += PAGE_SIZE / sizeof(*ptr);
}
- i915_gem_object_unpin_pages(obj);
+ i915_gem_object_unpin_map(obj);
return err;
}
@@ -1056,10 +1051,8 @@ static int cpu_check(struct drm_i915_gem_object *obj, u32 dword, u32 val)
{
if (i915_gem_object_has_struct_page(obj))
return __cpu_check_shmem(obj, dword, val);
- else if (i915_gem_object_is_lmem(obj))
- return __cpu_check_lmem(obj, dword, val);
-
- return -ENODEV;
+ else
+ return __cpu_check_vmap(obj, dword, val);
}
static int __igt_write_huge(struct intel_context *ce,
diff --git a/drivers/gpu/drm/i915/selftests/intel_memory_region.c b/drivers/gpu/drm/i915/selftests/intel_memory_region.c
index 04d0aa7b349e..3ef3620e0da5 100644
--- a/drivers/gpu/drm/i915/selftests/intel_memory_region.c
+++ b/drivers/gpu/drm/i915/selftests/intel_memory_region.c
@@ -270,36 +270,31 @@ static int igt_gpu_write_dw(struct intel_context *ce,
static int igt_cpu_check(struct drm_i915_gem_object *obj, u32 dword, u32 val)
{
- unsigned long n;
+ unsigned long n = obj->base.size >> PAGE_SHIFT;
+ u32 *ptr;
int err;
- i915_gem_object_lock(obj);
- err = i915_gem_object_set_to_wc_domain(obj, false);
- i915_gem_object_unlock(obj);
- if (err)
- return err;
-
- err = i915_gem_object_pin_pages(obj);
+ err = i915_gem_object_wait(obj, 0, MAX_SCHEDULE_TIMEOUT);
if (err)
return err;
- for (n = 0; n < obj->base.size >> PAGE_SHIFT; ++n) {
- u32 __iomem *base;
- u32 read_val;
-
- base = i915_gem_object_lmem_io_map_page_atomic(obj, n);
+ ptr = i915_gem_object_pin_map(obj, I915_MAP_WC);
+ if (IS_ERR(ptr))
+ return PTR_ERR(ptr);
- read_val = ioread32(base + dword);
- io_mapping_unmap_atomic(base);
- if (read_val != val) {
- pr_err("n=%lu base[%u]=%u, val=%u\n",
- n, dword, read_val, val);
+ ptr += dword;
+ while (n--) {
+ if (*ptr != val) {
+ pr_err("base[%u]=%08x, val=%08x\n",
+ dword, *ptr, val);
err = -EINVAL;
break;
}
+
+ ptr += PAGE_SIZE / sizeof(*ptr);
}
- i915_gem_object_unpin_pages(obj);
+ i915_gem_object_unpin_map(obj);
return err;
}
--
2.25.0.rc0
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